Pump



April 2 A. F. FROUSSARD 1,711,312

PUMP

Filed Aug. 18, 1927 2 Sheets-Sheet 1 21 Fig.2.

A.F.FROUSSARD TTORNEY Patented Apr. 30, 1929.

PATENT OFFICE.

ALBERT F. FROUSSARI), on sir. LOUIS,- MISSOURI;

PUMP.

Application filed August 18, 1 927. SerialNo. 213,717.

, My invention relates to a pump and particularly to one adapted for use in conveying milk in dairies creameries, or the like. 1 One object of my invention is to so constructthe cylinder block that it may be readily, de-

tached from the pumpand its parts disman tled for cleaning.

Another object of my invention is to provide for reversal of flow of the milk or other liquid pumped.

' Still another object of my invention is to provide simple and completely enclosed driving mechanism for the pump pistons.

In the accompanying drawings, which illustrate a duplex pump made in accordance with my invention, Figure 1 is a side elevation, partly in section; Figure 2 is a front view, the motor being broken away along the line 2-2 of Figure 1, and one of the guard plates being removed; Figure 3 is an enlarged section taken on the line 3-3 of Figure 1; Figure 4 is an enlarged top plan view of one of the cylinder blocks, the cover plate being removed; Figure 5 is a plan view of the cover plate oneendbeing broken away; Figure 6 is a vertical longitudinal section through one of the cylinder blocks; Figure 7 is a section on the line 7-7 of Figure 6; and Figure 8 is an enlarged sectional view of one of the valves. Q

Referring first to Figures 1, 2 and 3, 1 is a base plate on which are secured a pair of frames 2 and a motor 3. Driven from the motor 3 is a worm gearing contained in a casing 4 and including a driving shaft 5, the ends of which project into the frames 2. On each end of the driving shaft is a driving disk 6 provided with a wrist pin 7 This wrist pin projects into the slot 8 of a yoke 9 carrying a plunger 10. Upper and lower cross bars 11 of the frame 2 form hearings in which the plunger reciprocates. Guard plates 12 secured to the front and rear faces of the frame enclose the-plunger and its operating mechanism. Secured in the upper end of each of the plungers 10 is a piston rod 13.

Referring now more particularly to Figures 4 to 8, a bottom plate 14 for the cylinder block 15 is carried by each of the frames 2. The upper end of the cylinder block is closed by a cover plate 16 having a central boss 17 for engagement by a, clamping screw 18 threaded in a U-shaped clamp bar 19 pivoted at 20 to the sides of the frames 2. On the upper end of the screw 18 is a hand-wheel 21 by means of which the cylinder block may be clamped between the plates 1d and 16. In

order to insure a tight joint between the'ends of the plates and the block, I form on the block lugs 22, to which are pivoted bolts 23 adaptedto engage with slotted lugs 24 on the plates andprovided with wing nuts 25.

- Formed on theicylinder block is a central piston, bore 26 and two valve bores 27. In the bore 26 is the piston 28 carried onthe upper end of thepiston rod 13. y The interior of the cylinder block is cut out at both the upper and lower ends so as to allow free communication between the bores 26 and 27. In each of the bores 27 are a pair of valve blocks 29 separated by a cage 30. The valve blocks are held against the cage by upper and lower U-shaped spacing plates 31, of which the upper pair are removable, being held in position against the walls of the block by stop pins 82. The lower pair may also be removable but I prefer to rivet or otherwise permanently secure them in position. Each of the valve blocks is provided with a valve seat cooperating with a valve 33 carried on a stem 84. Threaded on the end of the stem 34 is a head 35 between which and the valve block is.

a spiral spring 36 normally holding the valve against its seat. 87 are inlet and outlet openings to which the supply and discharge pipes (not shown) are connected.

The operation of my pump is as follows: with the valve blocks in the position shown in Figure 6, the right hand opening 37. will be the inlet the milk passing in through the upg per right hand valve on the down stroke of the piston and through the lower right hand valve on the upper stroke. At the same time it will be discharged through the left hand opening 37 passing through the upper left hand valve on the up stroke of the piston and through the lower left hand valve on the down stroke. When it is desired to clean the pump the hand -wheel 21 is turned to move the screw 18 out of contact with the cover plateand allow the clamp bar 19 to be swung down ing 37 will serve as the inlet and the right hand opening as the outlet. It will also be seen that the piston operating parts are effectively enclosed so that no oil can escape from, or milk or water gain access to these parts.

Having fully described my invention, What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a device of the class described, the combination with a frame, of a cylinder block supported on said frame, a cover for said block, a clamping bar for securing said cover to said block and said block to the frame, and means in addition to and independent of said bar for securing the block and cover together.

2. In a device of the class described, the combination with a frame, of a cylinder block supported on said frame, a cover for said block, said block having a central piston bore and a pair of valve bores, a pair of independently removable valve blocks in each valve bore, a cage separating said valve blocks, a removable spacing plate for one Valve block of each pair bearing on the cover and holding the adjacent valve block against the cage, and means for securing the cover to the block and the block to the frame. 7

3. In a device of the class described, the combination with a frame, of a cylinder block supported on said frame, an elongated cover for said block, a clamping bar pivoted to the frame and carrying a screw bearing on the center of said cover, and pivoted bolts carried by said block and engaging with said cover.

4. In a device of the class described, the combination with a frame, of a cylinder block supported on said frame, a cover for said block, a clamping bar carrying a screw bearing on said cover, and pivoted bolts carried by said block and engaging with said cover and said frame.

In testimony whereof, I hereunto afiix my signature, this 15th day of August, 1927.

A. F. FROUSSARD. 

